Alarm-lock



(No Model.)

R; G. VASSAR.

ALARMVLOGK. Y

Patented Jan. 28, 1890.

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UNITED STATES PATENT OEEicE.

ROBERT G. VASSAR, OF NEV YORK, N. Y., ASSIGNOR, BY MESNE ASSIGN- MENTS,TO THE VASSAR BURGLAR ALARM MANUFACTURING OOM- rnnv, or NEW JERSEY.

ALARM-LOCK.

SPECIFICATIONformng part of Letters Patent No. 420,256, dated January28, 1890. Application iiled January 2l, 1838. Y Serial No. 261,454. (Nomodel.)

To @ZZ whom it may concern:

Be it known that l, ROBERT G. VAssAE, a citizen oil the United States,and a resident of New York, in the county of New York and State of NewYork, have invented certainv new and useful Improvements in MechanicalAlarms, of which the followingis a specificad tion.

My invention relates to the construction of an alarm mechanism designedmore particularly for application to door bolts and locks, and combinedwith the same in such a way that the application of pressure to the dooror to the bolt shall release the alarm mechanism and permit the same tosound.

The alarm mechanism of my invention is one in which the force ofanormally-detained spring is utilized upon the release of a detentmechanism to operate the alarm-bell.

My present invention relates more especially to the construction ofthedetent device for releasing the wheels connected with the spring andfor bringing the saine to rest when the alarm has sounded a certaintime; and the invention consists in the combination, with thedetent-lever, which engages with a wheel operated by the spring andserves to normally hold the same from movement, of a second wheel movingmore slowly than the detent-wheel and arranged to press the detent intore-engagement with the detent-wheel after the same has been released andhas made one or more revolutions.

My invention consists, further, in the combination, with the second ormore slowlymoving wheel, of a spring projection or lug arranged toengage with the detent-lever and to move the same into engagement withthe more quickly-moving detent-wheel- By my invention, as will moreclearly Aappear from the following description, taken in connection withthe accompanying drawings, the detenowheel may, after having beenreleased, make more than a single revolution, and yet may, after adetermined number of revolutions, be brought positively to rest throughthe action of the second wheel in forcing the detent into reengageinent.

Figure l is a side elevation of a 4doorbell:

provided with an alarm constructed in accordance with my invention, thetop plate of 'the case being removed.

Fig. 2 isa crosssection through the case on the line X of Fig. l, andshows the alarm mechanism in edge view. Fig. 3 is a plan of the detentlever and Wheel operating upon the same. Eig. t is an edge view of thesame devices the detent-wheel being shown in cross-section.

A, Eig.V l, indicates the door-bolt, and D the operating-slide for thesame, said'bolt being provided with an operating-spring and with a catch(not shown) and arranged substantially as my prior patent, No. 298,136,dated May 6, 1884.

The bolt A is capable of'a slight lateral movement on the interior ofthe case when pressure is applied to the door or to the bolt directly bymeans of a drill or other instrument, as described in my prior patent.The inner end E of the bolt is arranged to engage when so moved with thedetent-leverB of the alarm mechanism, said lever beingpivoted on a postof the alarm-train, as clearly shown. C indicates the detent-wheel, withwhich the detent or detentlever B engages to hold the train of wheelsfrom movement under the stress of a spring G, which latter is wound `upby any suitable means and 1s connected with a wheel H, through which anda pinion F the springimparts movement to the wheel C when the latterisreleased from the detent. The wheel C is the wheel by which movement isimparted to the bellhammer lever through an escapement 1n manner wellknown.

The detent or locking surfaces may be'of any desired kind but for sakeof simplicity I prefer to employ, as indicated more clearly in Fig. 4, apin K upon the detent-lever, which pin is adapted to enter a perforationor depression in the detent-wheel C, so as to hold the latter frommovement. y

The wheel H, which obviously will rotate more slowly than the wheel C,is in my inventonutilized as a means of throwing the detent devices intore=engagemen1i For this purpose it is provided with a projectionbf anydesired kind, arranged to press sidewise against the detent-lever, so asto throW the pin K into the perforation in the Wheel C at the properperiod in the revolution of the latter. The Wheel H should bear upon thelever B with an elastic pressure for this purpose, so as to `permit saidlever to move and withdraw the detent-surfaces from engagement when thebolt is moved laterally, so as to bring the part E thereon against theshorter arm of the lever. y V

In Figs. 2, 3, and 4 the detent-Wheel is shown as locked by thedetent-lever, the latter being pressed toward the Wheel by means of aspring projection L, carried by the Wheel H. When the lever is moved bythe bolt, the pin K is Withdrawn from engagement with Wheel C, and thelatter thereupon begins to rotate and to operate the bell-hammer. At thesame time the'wheel H rotates, carrying the projection L away fromengagement With the lever, said projection being moved entirely awayfrom the same by the time that the wheel C completes its revolution, sothat at the first revolution of the wheel the detent devices Will notre-engage. The Wheel C 'is therefore free to rotate and to continueoperating the bell-hammer until the wheel H has moved so as to bring theprojection L thereupon around into re'engage1nent with the detent-leverand to press the same side- Wise toward the Wheel C. The Wheel C maymake three or four revolutions, more or less, according to theparticular proportions of the gearing. The proportions are such,however, that the projection L Will come around intorposition to pressthe lever B toward the Wheel C at or near the time that the perforationin the Wheel approaches the pin K.

When this occurs, the detent devices are brought into engagement inobvious manner, and the train of Wheels is stopped from revolution. Thealarm then ceasing to sound, a subsequent operation of the bolt so as tomove the detent-lever will again permit the alarm to sound during thetime that the detent-Wheel makes the two or more revolutions permittedto it.

I do not limit myself to any particular form of engaging devices for thedetent, as there are many that may be used and are well-known in theart. Nor do I limit myself to any particular form of projection ordevice upon the second Wheel H for bringing the detent devices intoarrangement. It is desirable, however, that the detent-lever should be aspring-connection of some kind, so as to permit a movement of the lever,as already described, When the bolt is moved.

What I claim as my invention isl. The combination, with a detent-wheeland its detent, of a stud or projection carried by a Wheel of the trainfor pressing the detent into re-engagement with its Wheel, as andfor thepurpose described.

2. The combination, With the detent-wheel, of a detent-lever and asecond slowly-moving Wheel geared to the first and carrying a projectionthat bears With an elastic pressure on the detent-lever, so as to forcethe detent into engagement with the detent-wheel, While also permittingthe lever to be moved for purposes of releasing the detent-wheel.

ROBERT G. VASSAR.

Witnesses: l

REMSEN DARLING, JNO. S. DODGE.

